Document publication year
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- 1975 to 19762 objects
- 1977 to 19791 objects
- 1980 to 19810 objects
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- 1985 to 19860 objects
- 1987 to 19890 objects
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- 1992 to 19940 objects
- 1995 to 19960 objects
- 1997 to 19990 objects
- 20001 objects